The period may be substituted for any letter and still maintain a match : Meta characters « Regular Expressions Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial
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2.Query Select
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11.Character String Functions
12.Aggregate Functions
13.Date Timestamp Functions
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18.Regular Expressions Functions
19.Statistical Functions
20.Linear Regression Functions
21.PL SQL Data Types
22.PL SQL Statements
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Oracle PL/SQL Tutorial » Regular Expressions Functions » Meta characters 




SQL>
SQL> -- create demo table
SQL> create table myTable(
  2    id           NUMBER(2),
  3    value        VARCHAR(50)
  4  );

Table created.

SQL>
SQL> insert into myTable(id, value)values(1,'1234 4th St. Vancouver');

row created.

SQL> insert into myTable(id, value)values(2,'4 Maple Ct. New York');

row created.

SQL> insert into myTable(id, value)values(3,'4321 Green Blvd. London');

row created.

SQL> insert into myTable(id, value)values(4,'33 Third St. Toronto');

row created.

SQL> insert into myTable(id, value)values(5,'One First Drive. Queen');

row created.

SQL> insert into myTable(id, value)values(6,'1664 1/Springhill Ave');

row created.

SQL> insert into myTable(id, value)values(7,'66Fall Ave. Linken');

row created.

SQL>
SQL> select from mytable;

        ID VALUE
---------- --------------------------------------------------
         1 1234 4th St. Vancouver
         2 4 Maple Ct. New York
         3 4321 Green Blvd. London
         4 33 Third St. Toronto
         One First Drive. Queen
         6 1664 1/Springhill Ave
         7 665 Fall Ave. Linken

rows selected.

SQL>
SQL>
SQL> SELECT value, REGEXP_INSTR(value,'O.e') where_it_is
  2  FROM myTable
  3  WHERE REGEXP_INSTR(value,'O.e') 0;

VALUE                                              WHERE_IT_IS
-------------------------------------------------- -----------
One First Drive. Queen                                       1

SQL>
SQL>
SQL> drop table myTable;

Table dropped.

SQL>














18.6.Meta characters
18.6.1.Meta characters
18.6.2.The period may be substituted for any letter and still maintain a match
18.6.3.Use the caret-anchor to insist the matching start at the beginning of the string
18.6.4.Asking for a match for a capital 'F' followed by any character
18.6.5.The search string cannot be anchored at the beginning and then searched from some other position
18.6.6.Negating Carets
18.6.7.A '^' followed by something else like an 'l' (a lowercase 'L')
18.6.8.Match a string where 'i' is followed by any one character and followed by another 'i'
18.6.9.Regexp_Substr
18.6.10.'*' matches zero or more repetitions
18.6.11.'+' matches one or more repetitions
18.6.12.'?' matches exactly zero or one repetition
18.6.13.Asking to match an 'a' and zero or more 'b's:
18.6.14.A series of 'b's immediately following the 'a'
18.6.15.Matching at least one 'b'
18.6.16.Want an 'e' followed by any number of other characters and then another 'e'
18.6.17.REGEXP_SUBSTR(value,'e.*e')
18.6.18.Non-greedy '?'
18.6.19.Empty Strings and the ? Repetition Character
18.6.20.The '?' says to match zero or one time
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